[asterisk-users] Full Duplex

[Singer X.J. Wang]

We've had the same issue. For calls that go between a SIP connection 
(desktop phones) and Zaptel connections, there was a lot of problems 
with half duplex. We switched
from the Digium card to the Sangoma card and the problem went away.

Doug Lytle wrote:
> Ken Williams wrote:
>   
>> We’ve had an issue since we went live nearly two years ago on Asterisk 
>> where people complain about not being able to talk while someone else 
>> is talking. I had assumed for a very long time this was because of the 
>> phones we went live with (Grandstream GXP-2000’s) and for the longest 
>> time I
>>
>>     
>
> Sound like your echo canceller is set to aggressive. Make it like a 
> walky-talky.
>
>
>  From the archives, January 2006:
>
> On Friday 20 January 2006 15:36, Ronald Hartmann wrote:
>
>   
>>> Anyone know if it is possible to control how aggressively the
>>> "Aggressive" mode behaves.
>>>       
>>   
>>     
>
> No.
>
>
>   
>>> I have a situation where Normal echo cancellation is not quite enough,
>>> however when I turn on aggressive mode
>>> We are attacking it to hard and I am unhappy with the walkie talkie
>>> behaviour of the Aggressive mode.
>>>       
>>   
>>     
>
> The agressive canceller is agressive because it is designed to turn your voice 
> channel into a half-duplex (walkie-talkie) communications channel.  You can't 
> have a "half half duplex" situation.   :-) 
>
> Have you tried recent SVN trunk with the MG2 echo canceller?  I have found 
> that to be the absolute best to date.
>
> -A.
>
>
>
> Doug
>
>   


-- 
*Singer Wang*
/System and Database Engineer/
The Pythian Group
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